Update V8 DEPS.

Rolling v8/third_party/icu to e466f6ac8f60bb9697af4a91c6911c6fc4aec95f

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Review URL: https://codereview.chromium.org/1715283002

Cr-Commit-Position: refs/heads/master@{#34184}

DEPS

@@ -10,7 +10,7 @@ deps = {
   "v8/build/gyp":
     Var("git_url") + "/external/gyp.git" + "@" + "ed163ce233f76a950dce1751ac851dbe4b1c00cc",
   "v8/third_party/icu":
-    Var("git_url") + "/chromium/deps/icu.git" + "@" + "8f91ea3a7e0413df3312204058da856058a8099b",
+    Var("git_url") + "/chromium/deps/icu.git" + "@" + "e466f6ac8f60bb9697af4a91c6911c6fc4aec95f",
   "v8/buildtools":
     Var("git_url") + "/chromium/buildtools.git" + "@" + "ef3e530703353ba8ad094694ba7c156daddbddeb",
   "v8/base/trace_event/common":